drivers/char/ds1286.c: use time_before, time_before_eq, etc
authorJulia Lawall <julia@diku.dk>
Wed, 30 Apr 2008 07:53:58 +0000 (00:53 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 30 Apr 2008 15:29:45 +0000 (08:29 -0700)
The functions time_before, time_before_eq, time_after, and time_after_eq
are more robust for comparing jiffies against other values.

A simplified version of the semantic patch making this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@ change_compare_np @
expression E;
@@

(
- jiffies <= E
+ time_before_eq(jiffies,E)
|
- jiffies >= E
+ time_after_eq(jiffies,E)
|
- jiffies < E
+ time_before(jiffies,E)
|
- jiffies > E
+ time_after(jiffies,E)
)

@ include depends on change_compare_np @
@@

#include <linux/jiffies.h>

@ no_include depends on !include && change_compare_np @
@@

  #include <linux/...>
+ #include <linux/jiffies.h>
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/char/ds1286.c

index 59146e3..ea35ab2 100644 (file)
@@ -39,6 +39,7 @@
 #include <linux/spinlock.h>
 #include <linux/bcd.h>
 #include <linux/proc_fs.h>
+#include <linux/jiffies.h>
 
 #include <asm/uaccess.h>
 #include <asm/system.h>
@@ -451,7 +452,7 @@ static void ds1286_get_time(struct rtc_time *rtc_tm)
         */
 
        if (ds1286_is_updating() != 0)
-               while (jiffies - uip_watchdog < 2*HZ/100)
+               while (time_before(jiffies, uip_watchdog + 2*HZ/100))
                        barrier();
 
        /*